A statement was issued by the DUP, Ulster Unionists, TUV, PUP and the Ulster Political Research Group.

"If we are to convince unionists that violence is not the only response to those who have consistently succumbed to republican violence and threats of violence, we must provide alternative means to channel justified anger and outrage," the statement said.

"There will be a graduated unionist response involving the Orange Institution, the PUL (Protestant unionist loyalist) community and political unionism."